774 



Journal of Agricultural Research 



Vol. VI, No. 20 



greenhouse and in greenhouse flats in which tests were conducted out- 

 doors in warm weather. 



In one experiment it was calculated that 16 per cent of the impermeable 

 red-clover seeds, 5 per cent of the impermeable white-clover and sweet- 

 clover seeds, and 38 per cent of the impermeable alfalfa seeds produced 

 seedlings in greenhouse flats in three months. In the same time 5, 2, 3, 

 and 8 per cent, respectively, germinated in a germinating chamber at 

 room temperature, the rest remaining impermeable. 



On June 7, 1909, seeds remaining impermeable during germination 

 tests in germinating chambers were sowed in soil in large greenhouse flats, 

 which were then set outdoors in the warm space between two greenhouses. 

 The soil was kept watered, and observations were continued until Novem- 

 ber 30, 1909. During the latter half of November the temperature fell 

 below freezing several times, but the last few days of the test were warm. 

 The results of the tests are summarized in Table VI. 



Table; VI. 



-Production of seedlings by leguminous seeds which remained impermeable 

 during germination tests 



Kind of seed and test No. 



Red clover: 

 58593- • 

 83583- • 



85272. 

 8534I- 

 8537I- 

 85454- 



Average 



Sweet clover: 

 78539 



Alfalfa: 

 62874. 



78479- 

 85276. 



Average. 



Hairy vetch : 

 78326 



Number 



of seeds 



used. 



109 

 76 

 87 

 43 

 3° 

 25 



195 



75 

 3° 



24 



Percentage of seeds which produced seedlings 



1 month. 2 months. 3 months. 6 months 



75 

 53 



So 



69 



38 



7 

 16 



5 



7 



5 



23 



92 



57 

 90 



80 



38 



92 



57 

 9° 



So 



28 



5 



9 



5 



37 



16 



14 



14 



92 

 59 

 90 



80 



During the first 5 months of the experiment 4 per cent were produced; the remaining 10 per cent 

 during the last few days of the experiment, following the freezing of the soil. 



i. Only 14 per cent of the impermeable sweet-clover seeds and an 

 average of 14 per cent of the impermeable red-clover seeds produced 

 seedlings in six months. 



